Yes, don't do it unless you are planning on this being a full time race car. The welds in the sub-frame are not designed to take the loads of solid sub-frame mounts. The sub-frame frame welds are prone to crack. We have seen this with the Grand Am Challenge cars. If you were able to speak with an engineer from the Camaro TEAM they would tell you the same thing.

What were you expecting in terms of a performance gain from your solid sub-frame mounts?

Well Im superchared and chiped with a few other bolt on's. Im having horrible wheel hop issues. I havent been able to see what the car can do because I dont want to frag the rear end or grenade my driveshafts.